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____ [38]
3 years ago
8

I need help with math:

Mathematics
2 answers:
andre [41]3 years ago
7 0

Answer:

3

Step-by-step explanation:

13-4=9

11-4=7

16-4=12

9-4=5

15-4=11

mars1129 [50]3 years ago
4 0

Answer: y = x-4

Step-by-step explanation:

15 - 4 = 11

9 - 4 = 5

16 - 4 = 12

11 - 4 = 7

13 - 4 = 9

hopes this helps!!! :3

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WhAt is the answer to 8.3x=41.5
maks197457 [2]
The "answer" is the number that 'x' must be
in order for that equation to be true.

To find it, just divide each side of the equation by  8.3 .

Then it'll say        x = 5 .
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3 years ago
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What is 79 881/1000 as decimal
den301095 [7]
79.881 hope this helps 
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4 years ago
A country's population in 1991 was 136 million. In 2000 it was 141 million. Estimate the population in 2016 using the exponentia
katrin [286]
The answer is 150 million.

Step 1. Calculate the growth rate.
Step 2. Calculate the population number in 2014.

We will use the formula for exponential growth:
A = P * eⁿˣ
where:
A - the final amount (value)
P - the initial amount (value)
e - the mathematical constant (e ≈ 2.72)
n - the growth rate
x - the time

Step 1:
A = 141 million = 141 000 000
P = 136 million = 136 000 000
n = ?
x = 2000 - 1991 = 9
Therefore:
141 000 000 = 136000 000 * e ^{n*9} \\ e ^{n*9} =141000 000 /136000000 \\ e ^{n*9} =1.04

Logarithm both sides of the equation:
ln(e ^{n*9})=ln(1.04) \\ n*9*ln(e) = ln(1.04) \\ 6n=ln(1.04) \\ n = \frac{ln(1.04)}{9} \\ n = \frac{0.04}{9} \\ n = 0.004

Step 2:
Now when we know the growth rate, it is easy to estimate the population in 2016
A = ?
P = 141 000 000
n = 0.004
t = 2016 - 2000 = 16
A = 141 000 000 * e ^{0.004*16} \\ A = 141000 000 * e^{0.0640} \\ A = 141000 000 * 1.066\\ A = 150306 000

Thus, the population will be nearly 150 million in 2016
7 0
4 years ago
A seven-question quiz has four
liubo4ka [24]

Answer:

210

Step-by-step explanation:

Formula I made up: (Don't copy it please) (x-1 + x-2 + x-3... until x-(x-1)

Add all answers possible. (4 true and falses with 2 different answers each.) (3 multiple choice with 4 possible outcomes.)

4 x 2 = 8 | 3 x 4 = 12 |

       \              /

      8 + 12 = 20

Do what I like to call Additional factorial. (it's a little different, so follow the formula above.)

x = 20

20 -1 + 20 - 2... 20-(20-1) = 210

19 + 18... + 1  = 210

Compare my answer to others if you get any because I am just in 8th grade and I am a nerd at math and I love it. Because I am in 8th grade, I have a slight possibility for being wrong. Enjoy the answer and thanks for letting me use my skills for the world. :)

4 0
3 years ago
5 plz help me out I really need help
frez [133]
Perimeter 32. area 63
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